https://www.linux.com/news/boeing-joins-the-elisa-project-as-a-premier-member-to-strengthen-its-commitment-to-safety-critical-applications/

ELISA (Enabling Linux in Safety Applications) Project announced that Boeing has joined as a Premier member, marking its commitment to Linux and its effective use in safety critical applications. Hosted by the Linux Foundation, ELISA is an open source initiative that aims to create a shared set of tools and processes to help companies build and certify Linux-based safety-critical applications and systems

I imagine this means they’re contributing both actively and financially to Linux.